I think its really simple, do you believe that Jesus Christ is Lord? Then go and be baptised of water and of the Holy Spirit.
The book of Acts shows practical examples of this throughout.
Being baptised of the Holy Spirit is what happened to the church at Pentecost, into the good of which every believer comes at the new birth. "By one Spirit have we all been baptised into one body" (1 Corinthians 12.13).